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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8aa76cae9a30cf4a5c0be4c2f3bf1c7fc1e53033ef701ac48e3747cdbc7924' 
  AND token = 'M/VHtGH1en9ULqRVk7dt/KgBsfFhJY4jCtPhN0ihul8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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