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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9b0fb45217b855c95a99b152bdbcd7603ee5b12b3a5c536fea082d85cf5f2e' 
  AND token = 'a7wAL4TXuML4m+QKKdqSqegzCvGerCbEDDzQ6D37Beg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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