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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd208f1f45f78c4fda63cf5d2a4768c3cd8e7d84a6d6fdf7a6ed6b3db610d97' 
  AND token = 'hpAAoQPE7k4hsV/MyKYivWHlMfDiVY2icZFzChANguc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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