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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9589d93f0067dca88c0dfbe5d6ad736d3dcfbddd440867e70da4118075a5a423' 
  AND token = '3MzK1wadAqCNn9LkcVKgGQ8FBv1UzDWPPoMdovMzpjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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