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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab7af2a566194c927cfbd6d35924232c73499685dfc703b79d3a889fc1d66f7' 
  AND token = 'IBlAtv0MqP/bTeHYT1FgIT2BsAh7ptH4D9lPt3lAW4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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