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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4ac4cad5fb5049a6f421754f71ddbfbf70e300ba7ae15356e6e2e812acb003' 
  AND token = 'r8gyimK12I9lo59Rw76TJesVHRf5S9AnMO26+J58E18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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