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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0edf88fc063028c5c208bfd2b2aee4558d859a2bd3c503a0f1aa1e4ac13730b4' 
  AND token = 'EZ1Dyc7DJEkQTSfk8jBCRx9+LvXbfAUkCUsvWJsCSOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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