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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba9c3498da9d5bf078633501a8a7aadab0ea8ea1463b2b59ea4d8b19c7d68b9' 
  AND token = 'H2cpqniS1Ae6jgVh+P6lgx5WTXRSxaHKLzdgC11yINw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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