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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a686be66f1e3f8d5f440c1fe743d4bb7adab5748f8fb5eca737db08ec3c6b2c1' 
  AND token = 'OrdwdrSRlKs8g+7RPNmTO/5h4o0Nw3xuzmGITo0CQ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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