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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd55748a9d58291280c869be04f6814e68cf06f9e80a30c8edb6bbb9941c434a' 
  AND token = 'k6EPtByB0Dgl8Nk5iFfU4EYpDMx+rLMiVaIw5pnZqaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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