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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a26b994f8e8ce2ba40d54ef8b4c95a2a9208e2d3cf847fc227f6f73fbe9c37' 
  AND token = '6fpl/xnamTvaFScnbxOfV9dsm2x0JHnc9g3cqsD5MhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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