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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3b17013ff7f6bb5c228d9e5adb351e0ccfa8ac60a70690d9237b197058d87e' 
  AND token = 'Jg0qUb3B30kOfhiDPURWrRvOglllxW2XNm5Thzs3i6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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