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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945b0812693ca50e653cb2f2587983622f56ab89ca184d2d11070baa0a94260b' 
  AND token = 'MsS3bYE2gaYBHOvbGKsSRwnZWewL42oBNmOlNElePpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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