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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b968bcd3ae9d0bfa22e4a1a3b1ac1aa5c62a4eb9bc99db1ae6be4d2231042d4' 
  AND token = 'gu18FvGd1P3ERrGFmXzMl2zlKrqE4ZdvOsVxLIK4WLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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