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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5d0593ac461903cbcd3a2a88a132491f89be16f0c616f328ffe946a41a7979' 
  AND token = 'p4fIy1fo722uTpasUy3Q55CeZ8o3qbtLb0YdKO1EYAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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