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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdfe8ddb8e5c637510c91becadb0b90328e8e7f394b5f68c8169e6f4a2d54ef' 
  AND token = 'J852ZT3tAiO5OWuSH8H9lWWQAQ2mQCOwXYG6N/vl4rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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