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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38ebcd2050d45cb5b3ba99536e613ce7502507b1213b92767efebc955e0875c' 
  AND token = 'bDd5tsoIFjpZMgv8INgfd7dQyXyUnAa3V4sAi1jhGBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}