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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcdf3bb287142e10acd58eb501e79b98c82eabba28a15f03f95ec56838bab2a' 
  AND token = 'VNjl+ty6+ojIvL3GPo6LwpkkSsVJPNt6zaWlYz7StkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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