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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24c16746b9a02c292404c68a5f3343be55a8e06669e0de913db38d4e24d125c' 
  AND token = 'XdW7xdMU8n5uqg5y02VtFGAfNLuTAfF7j2xYbmtrATo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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