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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab46cc5191d87f7ec2e9305e2405e9c6f063c76328f271a804ac805147dbbd35' 
  AND token = 'n/WaDbsfxjACu6CrHsDqKezq61fIxNGoKMw/doxXKVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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