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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c32dcabb543d45b04e1f4bed8c0ac9aad85a6e6ff558eb3ca4c2ad9b8fedee' 
  AND token = 'uwkOl5hA9xMfmYQJD6IJU999QK49MPn5vX+6o2xmKkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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