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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d2e27c5787b16658337287c6de9bb4022e28b0076d70dec71bcef643fa5d21' 
  AND token = 'oJwI3okSSGp+4cCuoasam6zpYMrLMzrkJG3A7XaXmVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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