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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7615e907f76b8ee5691678a3feb9a6a3b984da9d0b8af61e4f9d077747f9fe00' 
  AND token = '8txfBaj4TI/c+hTzNHTRAzEkd8+Ppbu7Osq+KoTEKj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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