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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551d31ea63bf9a95edc94db34709475667aa79e1516ce3e6c3473580cdbcd8bb' 
  AND token = 'bKSSg3CIRcHg/cowCPtHvWq8IG1RaiB0LNU9uWO0oro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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