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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c607a6728d298b496924f60cc969b90be00e5801d5da644c44e1470c2d464fa' 
  AND token = 'vI4QEGr2bp1Gemk4FvqCouxnASK5h55g2s04xvSeLqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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