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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed377d25c5fc0a20ca9e3b7a829eb642ded4cd7f4bf54560f536ffe650ac7f76' 
  AND token = 'm3pcl52U+ggDGZ3Cjdg5d1WNVLQqo77gvhqxeRm+cdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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