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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2552c123c045d28bb02874e12d1014f3beb4dd6478bceb4731a4b5013660ab49' 
  AND token = 'jGA8Xi5cfA1QvTHmiwo2ASxxSFRxuhhSi8GLMntT+wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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