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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9dea52d26fa570dfa275abc783727025063232e02e1b8289dd14e75456a0a5a' 
  AND token = 'BzlVt5RL9XXhI78hHJ8i57DB8RoVP6k2ZH0+fCJJxzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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