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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23f3c7673e0ffedb434d037dc852a6351101605ccf84f1e75f8f01eb3ef8b4b' 
  AND token = '2KtmmqZRLt61d2QpjJCS9CHi38fL27zJPJMuWevrhv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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