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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd00fbc2fe988b0340bfabb0645edd26397ca78d55360396ca52cd3223e5864' 
  AND token = 'LJX1bIJgwyYZNpcNXIvzmN/OPJsSt98C+5eZ1fuQ8Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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