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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecf2cf08a4b56ebba23d53746d051d5556e8271ff7735e651008b7afa581cf7' 
  AND token = 'FPgCegVujgHNy0Cnn+69tXya4qW4mDTe8Un7+SULEMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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