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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e083c45ae538170d5b375061440d5efa4caa0d7476af8488dd3408db2aaf6d' 
  AND token = 't/i5irDM6zi7kMj2y99A4fTMeQ6gNoOkD77CphneuQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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