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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd206bc0a0404598275d515789db80dfa41e779da85f1b498acb93dc8e6fcef' 
  AND token = '1SIZcYFoDPjC/uyb9XJQnpuyrFP3SE5FSD+bD+EMwlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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