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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9100138be42972f9e97ee7cd6e5e299c8defa26e14dd17dca1a3670fea7ebb' 
  AND token = 'bBs6a8q58L7eGsY9qr+R5MZMxPJ3+E/BJ/iBRwoPKCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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