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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dafb714dc3ef83e0ecc9021d9c365551bb2b6ecce127b92c4fd8cd7327a0e5a' 
  AND token = 'ds/QiKSWHGlC+yscZP0ijp/GfydWyFTa8WB4vzZFA1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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