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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361c9edd7f177f84a7e4fa236c187df3cf6577a2ed1c81680b313b8f4fd84550' 
  AND token = 'XcR2fbnbG3l27Vm8yffa+0t8mQeZMewoBGTtjJHwzWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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