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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885216cdb287a98e490b27f2600e91f7deed14665a5da07b1475acab2a5a1dd9' 
  AND token = 'tgXshijzEx7r/wPTetVhsUZyexft7naMu4HmpXn4SNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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