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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bc265cbabf3e0c76c8ff1cf88319ba2e72f08f6b431ec5999308de10812582' 
  AND token = 'n1bq/5rj1Ox457YzFzgUUJrMbze2TWQYLyX/y5LnrjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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