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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf99be3e105d8ed13f5738c190dd2d45d66de5a772724813f04acd36d898b47' 
  AND token = 'jyobcqvYx7WUzjYHaaseUEXleInqTKX3V+yTfEEypC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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