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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4742cda8f26b74735e4d0c58743c5257bf2f91a0733a0847c55c4f10327d8798' 
  AND token = 'QyT+D+rgK347DlklZeumZ2gmI6t9ZR9vFmewNS2AIdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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