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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31968f7d53a1a3e84cbe87c36cf696aea88fcb29d283c34f44942ac52e07369' 
  AND token = '1g+V7pjgSy+VbImuzdofvzmdhnduEQn/3HaA2it1DOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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