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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23474ec4abade515325106c503ef8ca6c67107c4fa742650fc478ebe600c4a78' 
  AND token = '5C4PCnxbWr7Xf4nqG3Vh39H0poIEb8EvrK2SiJXUSv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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