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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96199ba3d2c7f233aeb1ca47a3cf63a21571a3955b5e97137f1a5c109a90cd2e' 
  AND token = 'Ft1AqPIvtC1s1w75kbaQb09loBb++idftzvroRCkQX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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