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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4cac5d844c5eca69c2a86c27439c6a8bdb263bafc66ac5aed83363b15613c3' 
  AND token = 'Cck5FWx9z4bi5U2bNdKmcTQacd1/MgdxWQXkYVUEHvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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