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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842ca513cf31b09845d422bf4b1098eab399a25762568082aa59ee827cd2fddc' 
  AND token = '7u59tS2J7mDPV4SJmndNCyvpzVNDRWM93CfFwQhk/AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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