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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cdade99cf1cc1f4c1c3f45be3050c3a33e87b62db06a0c74eee64ce3647f0a' 
  AND token = 'onjof9p3g2NFUz3qYhJig7GRbmApeA6OMogrc5u7XMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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