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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dbd6940abf4e71e876a360427fca3f48d5c73130b8a9b107fc10bc1dc2d1b9' 
  AND token = 'BblHbcMbwxpR/6pH5hRGF8ZqsoypavSsU7qys0hZ6Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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