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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89691804e86a20ff0b76ac86797281b03cc2f21d80cf25803a877ba255630d1b' 
  AND token = 'l6IW3NUaeCjO5tJT+rl3gFhem/bGawxF2/KdpSiEKgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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