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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bc7d08bc188d4e55f52b95a77b77771659d4a3053717d23d953de4e8ad3b28' 
  AND token = 'tTq95tX+7bVYAB6TYwU7oLTDB+K/DdT3zWxm9FC9gcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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