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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf7f6527c935fe51d44a72b11881123425314cd710c6e6f65f06bef0136b65d' 
  AND token = 'JdtqwwnjEG7ksakI6EodpDwekPM7KdGEvHjkje7bdbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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