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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad2912407e30c1f35331f893e412145ad3c4f9935af5b01127973c02caf7fdf' 
  AND token = 'cp4Iwk/18LhwEi8Sj+7YJafZWawf5/gWm9Lbo+rn9G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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