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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec80c53271b1b8f2c3b96a5987e952a57bd28613b27706fb3b7c3eb37dd6648' 
  AND token = 'g4jMDYvrNsdHNTJ71WVhKLEpaTUJJQoHtFccReWBF9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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