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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b434d3cc521b2c8f6ed65b938900c476bee039fcc7dd0150ded92cfbb0c505' 
  AND token = 'cdTzRsvGB4wOZIAa7awMZP6lmJKqhu6RI03S/3Mc2a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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