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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b6003b838ac1ba9463366a8b1507547190fcd0d1a57d03f016ec69a2c21a75' 
  AND token = 'QSbBOGeTRk2m7WU4dKV43A6j6V79TIWhube5EtLsKh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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