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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daae71987748eaada062a92977471bd2e129eb91f53f3e96236309fb84751152' 
  AND token = 'yA/y/5CX/NQfoVbY8Oy3G/qy0amkUB+oGqGXRQLqFPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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