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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee5fc4f7aff7778835baadd09146f49f31d23107c819d260787f88728fe90da' 
  AND token = 'XNCR/hAkjV96L280XRFY5PQWry9gO55vlCSmAQgCovk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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