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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ffa5c618d6cea0e6e1cae553799c548472b092297d11add38bc01fd80c754e' 
  AND token = 'kNFWfOGe/x1V6UZrlOSipQ4joifjtJAfF8ZlmC5Ehy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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