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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d4982c5430f34c6d19aee449adecf99bb7c3b9cdc3e940c3fac7d26a8677f8' 
  AND token = 'xJfPJCf9SgzWAcyoynW4Z670ixIw3O0tUYhJwylPMuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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