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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c325ca2165fd83498763517d0c67e3d768278de3e0a6f2f76cfbfc66208fc5' 
  AND token = '+W7R0ryOt4SLrm4+RikSnQQtN3KpEQzUXPrQV10avyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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