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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60e8ec0c628790ccd50d0924ca3ace503abaa629725b11fdc69c499785631eb' 
  AND token = 'KEC2/+lTTUk0iNhhHoy5pnMT1rMwbOHc5cPQeJ3sNyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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