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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0870ef13778c9fffe5ee37fa2925f69de987bafabc4d7e5db858f6b6f5c02467' 
  AND token = 'zNdV4vtoZDrUy50eYP6CWsJRKXs9PYKGYpisnEWj5hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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