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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe62c79492c07082e4f79ebe4d2f53a56fd66cc5d052e02c8eb55d7c14d01f9' 
  AND token = 'qN6thlDt3+gKRzeD1VDPQgsApEn05m6C3meXB3XrNkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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