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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe85665420f3cc328ee97cfeaf00954fe2ed7498bbfa90974dbb767e4ce508fb' 
  AND token = '+SAY+vvsqMG6O1zEtnC5W1Oki6ANdph+/YSaclijGmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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