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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c875777883aedbef809c572e80a69a971899a0cf6ae2a4229ff539cb1f6ee85f' 
  AND token = '6nr59uUIVM7qp62OvA8EYj87ZN7otsnLimrJ/WGqu9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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