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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce62173b37739e2dcb8afa733143ae87969b55e034eea47f9225585ca454eb1' 
  AND token = 'd7/Zd7cI/9y79pmie9YYpnoZq7CLdDytMa2GRhUbH5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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